3. Field Testing

There are no requirements that electrical parameters and safety parameters for device itself should be retested on the field.

But safety tests have to be executed for the installation where charger is connected. We recommend you execute safety test on charger output while charger running and charging. In this way you can validate all components to the vehicle to prove valid electrical security parameters.

Contact the manufacturer to get more information about test devices which can perform such tests.

3.1 Checking the Operation of the Circuit Breaker

The monitoring of the safety element consists in setting the circuit breakers in the OFF position (protection contacts open) at the current supply voltage at the station input terminals - there is no voltage at the device output terminals and the station remains without power.

INCH DUO has four MCBs – miniature circuit breakers. The main MCB is for 80 A, additionally each charging spot is equipped with a 40 A MCB. Electronics are protected with 6 A MCB.

Verification of proper operation of the switch is in checking the device status indicator in this position of the switch - it should not be lit. Setting the switch in the ON position (closed contacts of the protection) causes the appearance of voltage on the output terminals of the protection and lighting of the device status indicator.

3.2 Checking the Operation of the RCD

The residual current protection should be checked by monthly checking its operation with the TEST button. After pressing it, the protection should trip, resulting in a lack of voltage at the device output terminals.

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A test of the effectiveness of automatic power off using a residual current device should also be carried out. To do this, you should simulate a charging session using a suitable device (e.g., simulator) and with the help of a suitable testing device that can measure the actual trip current of the device and its tripping time (optional).

The test result is considered positive if the results obtained meet the requirements of local regulations and applicable standards, taking into account the characteristics of the device.

3.3 Checking the Effectiveness of Electric Shock Protection

Checking the effectiveness of electric shock protection consists of:

a) Short circuit loop impedance measurement.

b) Checking the characteristics and / or the effectiveness of the protective device.

In order to measure short circuit loop impedance, you should simulate a charging session using a suitable device (e.g., simulator) and measure its value at the output of the charging station using a suitable testing device.
The obtained value is considered correct if it meets the requirements of local regulations and applicable standards.

3.4 Checking the Continuity of Connections

Check the continuity of the protective conductors. Checks have to be made between the PE contact in the socket / plug of the charger and the grounding terminal of the station. The measurement should be made using a suitable testing device. The value is considered acceptable if it does not exceed 1 Ω.

3.5 Checking the Insulation Resistance of the Main Circuits of the Charging Station

Before starting the measurement, disconnect the charging station from the power supply. Measurement of insulation resistance should be made using a suitable testing device by applying a test voltage (500 V DC) between each pair of active conductors and between active conductors and the protective conductor at the outlet of the charging socket. The minimum acceptable resistance value is 1 MΩ.